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Your search keyword '"Ishida, Masatoshi"' showing total 20 results
Start Over Author "Ishida, Masatoshi" Journal angewandte chemie
20 results on '"Ishida, Masatoshi"'

1. Metalla‐Carbaporphyrinoids Consisting of an Acyclic N‐Confused Tetrapyrrole Analogue Served as Stable Near‐Infrared‐II Dyes

Author

Basumatary, Biju, primary, Tsuruda, Hidetoshi, additional, Szczepanik, Dariusz W, additional, Lee, Jiyeon, additional, Ryu, Jaehyeok, additional, Mori, Shigeki, additional, Yamagata, Kyo, additional, Tanaka, Takayuki, additional, Muranaka, Atsuya, additional, Uchiyama, Masanobu, additional, Kim, Jiwon, additional, Ishida, Masatoshi, additional, and Furuta, Hiroyuki, additional

Published
2024
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3. Antiaromatic Sapphyrin Isomer: Transformation into Contracted Porphyrinoids with Variable Aromaticity.

Author

Li, Qizhao, Ishida, Masatoshi, Wang, Yunyun, Li, Chengjie, Baryshnikov, Glib, Zhu, Bin, Sha, Feng, Wu, Xinyan, Ågren, Hans, Furuta, Hiroyuki, and Xie, Yongshu

Subjects
*ISOMERS, *AROMATICITY, *RING formation (Chemistry), *ANTIAROMATICITY, *ELECTRONIC structure, *PYRROLES, *PORPHYRINS, *ERGOT alkaloids
Abstract

Sapphyrin is a pentapyrrolic expanded porphyrin with a 22π aromatic character. Herein, we report the synthesis of a 20π antiaromatic sapphyrin isomer 1 by oxidative cyclization of a pentapyrrane precursor P5 with a terminal β‐linked pyrrole. The resulting isomer 1, containing a mis‐linked bipyrrole unit in the skeleton, exhibits a reactivity for further oxidation due to the distinct antiaromatic electronic structure, affording a fused macrocycle 2, possessing a spiro‐carbon‐containing [5.6.5.6]‐tetracyclic structure. Subsequent treatment with an acid afforded a weakly aromatic pyrrolone‐appended N‐confused corrole 3, and thermal fusion gave a [5.6.5.7]‐tetracyclic‐ring‐embedded 14π aromatic triphyrin(2.1.1) analog 4. The cyclization at the mis‐linked pyrrole moiety of P5 played a crucial role in synthesizing the antiaromatic porphyrinoid susceptible to facile transformation to novel porphyrinoids with variable aromaticity. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Near‐Infrared‐III‐Absorbing and ‐Emitting Dyes: Energy‐Gap Engineering of Expanded Porphyrinoids via Metallation

Author

Wang, Yue, primary, Ogasahara, Koki, additional, Tomihama, Daisuke, additional, Mysliborski, Radomir, additional, Ishida, Masatoshi, additional, Hong, Yongseok, additional, Notsuka, Yusuke, additional, Yamaoka, Yoshihisa, additional, Murayama, Tomotaka, additional, Muranaka, Atsuya, additional, Uchiyama, Masanobu, additional, Mori, Shigeki, additional, Yasutake, Yuhsuke, additional, Fukatsu, Susumu, additional, Kim, Dongho, additional, and Furuta, Hiroyuki, additional

Published
2020
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9. N‐Confused Phlorin‐Prodigiosin Chimera: meso‐Aryl Oxidation and π‐Extension Triggered by Peripheral Coordination.

Author

Su, Guangxian, Li, Qizhao, Ishida, Masatoshi, Li, Chengjie, Sha, Feng, Wu, Xin‐Yan, Wang, Lu, Baryshnikov, Glib, Li, Dawei, Ågren, Hans, Furuta, Hiroyuki, and Xie, Yongshu

Subjects
PHENOXY groups, OXIDATION, ISOMERS
Abstract

An N‐confused phlorin isomer bearing a dipyrrin moiety at the α‐position of the confused pyrrole ring (1) was synthesized. PdII and BIII coordination at the peripheral prodigiosin‐like moiety of 1 afforded the corresponding complexes 2 and 3. Reflux of 2 in triethylamine (TEA) converted the meso‐phenyl into the PdII‐coordinating phenoxy group to afford 4. Under the same reaction conditions, TEA was linked to the α‐position of the dipyrrin unit in 3 as an N,N‐diethylaminovinyl group to afford 5. Furthermore, peripheral coordination of BIII in 3 and 5 improved the planarity of the phlorin macrocycle and thus facilitated the coordination of AgIII at the inner cavity to afford 3‐Ag and 5‐Ag, respectively. These results provide an effective approach for developing unique porphyrinoids through peripheral coordination. [ABSTRACT FROM AUTHOR]

Published
2020
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11. Boron Difluoride Complexes of Expanded N‐Confused Calix[ n ]phyrins That Demonstrate Unique Luminescent and Lasing Properties

Author

Ishida, Masatoshi, primary, Omagari, Toshihiro, additional, Hirosawa, Ryuji, additional, Jono, Keisuke, additional, Sung, Young Mo, additional, Yasutake, Yuhsuke, additional, Uno, Hidemitsu, additional, Toganoh, Motoki, additional, Nakanotani, Hajime, additional, Fukatsu, Susumu, additional, Kim, Dongho, additional, and Furuta, Hiroyuki, additional

Published
2016
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15. Tetracyanoquaterrylene and Tetracyanohexarylenequinodimethanes with Tunable Ground States and Strong Near-Infrared Absorption

Author

Zeng, Zebing, primary, Lee, Sangsu, additional, Zafra, José L., additional, Ishida, Masatoshi, additional, Zhu, Xiaojian, additional, Sun, Zhe, additional, Ni, Yong, additional, Webster, Richard D., additional, Li, Run-Wei, additional, López Navarrete, Juan T., additional, Chi, Chunyan, additional, Ding, Jun, additional, Casado, Juan, additional, Kim, Dongho, additional, and Wu, Jishan, additional

Published
2013
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16. Boron Difluoride Complexes of Expanded N-Confused Calix[ n]phyrins That Demonstrate Unique Luminescent and Lasing Properties.

Author

Ishida, Masatoshi, Omagari, Toshihiro, Hirosawa, Ryuji, Jono, Keisuke, Sung, Young Mo, Yasutake, Yuhsuke, Uno, Hidemitsu, Toganoh, Motoki, Nakanotani, Hajime, Fukatsu, Susumu, Kim, Dongho, and Furuta, Hiroyuki

Subjects
*CALIXPHYRINS, *LUMINESCENCE, *MACROCYCLIC compounds, *EMISSION control, *WAVELENGTHS
Abstract

Complexation of novel multiply N-confused expanded calix[ n]phyrins with boron difluoride afforded a new class of cyclic BODIPY (boron-dipyrromethene) arrays. The structures of circularly arranged BODIPY subunits linked in an N-confused fashion give rise to such photophysical properties unique to the macrocycles as redshifted emission wavelengths along with apparent large Stokes shifts, long emission lifetimes, and solid-state lasing. The DFT calculations support the size-dependent excited-state dynamics of the macrocycles. [ABSTRACT FROM AUTHOR]

Published
2016
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17. A Diradical Approach towards BODIPY-Based Dyes with Intense Near-Infrared Absorption around λ=1100 nm.

Author

Ni, Yong, Lee, Sangsu, Son, Minjung, Aratani, Naoki, Ishida, Masatoshi, Samanta, Animesh, Yamada, Hiroko, Chang, Young ‐ Tae, Furuta, Hiroyuki, Kim, Dongho, and Wu, Jishan

Subjects
INFRARED absorption, ORGANIC dyes, QUINODIMETHANE, LIGHT absorption, ISOMERIZATION, ELECTROMAGNETIC spectrum
Abstract

A diradical approach to obtain stable organic dyes with intense absorption around λ=1100 nm is reported. The para- and meta-quinodimethane-bridged BODIPY dimers BD-1 and BD-2 were synthesized and were found to have a small amount of diradical character. These molecules exhibited very intense absorption at λ=1088 nm ( ɛ=6.65×105 M−1 cm−1) and 1136 nm ( ɛ=6.44×105 M−1 cm−1), respectively, together with large two-photon-absorption cross-sections. Structural isomerization induced little variation in their diradical character but distinctive differences in their physical properties. Moreover, the compounds showed a selective fluorescence turn-on response in the presence of the hydroxyl radical but not with other reactive oxygen species. [ABSTRACT FROM AUTHOR]

Published
2016
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